How does a phaco machine work?
How does a phaco machine work?
The phaco probe is an ultrasonic handpiece with a titanium or steel needle. The tip of the needle vibrates at ultrasonic frequency to sculpt and emulsify the cataract while the pump aspirates particles through the tip.
What is the meaning of phaco?
Phacoemulsification, or phaco, is method of cataract surgery in which the eye’s internal lens is emulsified using ultrasonic energy and replaced with an intraocular lens implant, or IOL. Surgery is performed under a local anesthetic, which prevents movement of the eye.
What is aspiration flow rate?
Aspiration flow rate is the volume of fluid flowing through the tubing at any given time. This is often reported in cubic centimeters per minute (cc/min). With a peristaltic pump, flow is determined by the speed of the pump.
How many types of pumps are present in phaco surgery?
Two primary vacuum pumps are used in phacoemulsification platforms — peristaltic and venturi. Although they work in different ways, each has its advantages.
How is phacoemulsification performed?
How Is Phacoemulsification Performed? During phacoemulsification, a surgeon makes a small incision at the edge of the cornea and then creates an opening in the membrane that surrounds the lens. A small ultrasonic probe is then inserted, breaking up the cloudy lens into tiny fragments.
How do you maintain phacoemulsification?
To maintain a relatively stable anterior chamber pressure during phacoemulsification, the inflow of balanced saline solution through the irrigation line must match the outflow of fluid from the aspiration line plus the leakage from the incisions.
Who invented phaco?
| Charles Kelman | |
|---|---|
| Education | Tufts University, B.S., 1950 University of Geneva, M.D., 1956 |
| Occupation | Ophthalmologist, surgeon, inventor, jazz musician, entertainer and Broadway producer |
| Known for | Inventing phacoemulsification as well as other surgical techniques and instruments |
How do you prevent surge phaco?
According to Dr. Fishkind, surge can be prevented in post-occlusion by changing the foot pedal yaw on the Millennium. “At one point we use vacuum, at one point we use phaco power and we can have vacuum independent of phaco power,” he said.
What does PC IOL stand for?
Posterior Chamber Intraocular Lens
Definition. PCIOL. Posterior Chamber Intraocular Lens. Copyright 1988-2018 AcronymFinder.com, All rights reserved.
Which pump is used for long time in phacoemulsification?
When the phaco needle tip is occluded with cataract material, a high vacuum state is created within the outflow tubing….Addressing the problem of surge.
| Peristaltic | Venturi |
|---|---|
| Vacuum created on occlusion of phaco tip | Vacuum created instantly via pump |
What’s the difference between pharmacodynamics and PK in medicine?
The difference between pharmacokinetics and pharmacodynamics is that pharmacokinetics (PK) is defined as the movement of drugs through the body, whereas pharmacodynamics (PD) is defined as the body’s biological response to drugs.
How is pharmacodynamics related to the site of action?
Definitions. It refers to the relationship between drug concentration at the site of action and any resulting effects namely, the intensity and time course of the effect and adverse effects. Pharmacodynamics is affected by receptor binding and sensitivity, postreceptor effects, and chemical interactions.
What is the difference between pharmacodynamics and biologics?
Pharmacodynamics is broadly defined as the biologic effects resulting from the interaction between drugs and biologic systems. 1 A simple and useful distinction is to think of pharmacodynamics as “what the drug does to the body” whereas pharmacokinetics (see Chapter 13, Pharmacokinetics) is “what the body does to the drug.”
What do you mean by efficacy in pharmacodynamics?
Efficacy: the ability of a drug to produce a pharmacological response when it interacts with its receptor. 5. First-pass metabolism:a type of metabolism in which drugs that are absorbed by the gastrointestinal tract go through the portal vein to the liver and are metabolized there before they are distributed to the general circulation.
